Home / 712,518.40-983,297.76-390,259.36

Finding the Fourth Proportional to 712,518.40, 983,297.76 and 390,259.36

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Solution

The fourth proportional to 712,518.40, 983,297.76 and 390,259.36 is: 538,570.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,518.40 : 983,297.76 = 390,259.36 : x
  2. Step 2: Convert to fraction form
    712,518.40/983,297.76 = 390,259.36/x
  3. Step 3: Cross multiply
    712,518.40x = 983,297.76 × 390,259.36
  4. Step 4: Simplify right side
    712,518.40x = 383,741,154,507.03
  5. Step 5: Solve for x
    x = 383,741,154,507.03/712,518.40
  6. Step 6: Final answer
    x = 538,570.17

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.